Study guide
14.5 Public & Private Necessity
California First-Year Law Students' Examination Baby Bar
Track your progress as you read
Finished sections get a check mark.
1 Introduction & FYLSE Examination Guide
1.1 FYLSE Exam Structure, Passing Standard & Administration 1.2 Study Method, Pacing & MBE-Style Technique
2 Contracts: Mutual Assent, Capacity & Contract Formation
2.1 The Offer & Objective Theory of Assent 2.2 Termination & Irrevocability of Offers 2.3 Acceptance & the Mailbox Rule 2.4 Mirror Image Rule & UCC 2-207 Battle of the Forms 2.5 Mistake in Contract Formation 2.6 Fraud, Duress, Undue Influence & Illegality 2.7 Capacity to Contract
3 Contracts: Consideration, Estoppel & Implied Obligations
3.1 Consideration & the Bargained-For Exchange 3.2 Past & Moral Consideration, Pre-Existing Duty & Modification 3.3 Promissory Estoppel & Detrimental Reliance 3.4 Implied-in-Fact Contracts & Quasi-Contract 3.5 Implied Covenant of Good Faith, Fair Dealing & Indefinite Terms
4 Contracts: Third-Party Beneficiaries, Assignment & Delegation
4.1 Third-Party Beneficiary Contracts 4.2 Assignment of Rights 4.3 Delegation of Duties
5 Contracts: Statute of Frauds, Parol Evidence & Interpretation
5.1 Statute of Frauds: Contracts Within the Statute 5.2 Satisfying the Statute: Writing, Signature & Exceptions 5.3 The Parol Evidence Rule 5.4 Contract Interpretation & Canons of Construction
6 Contracts: Performance, Conditions, UCC Warranties & Breach
6.1 Conditions: Express, Constructive & Excuse 6.2 Substantial Performance vs. Perfect Tender 6.3 Cure, Rejection, Revocation & Installment Contracts 6.4 UCC Article 2 Warranties & Risk of Loss 6.5 Anticipatory Repudiation & Insecurity
7 Contracts: Remedies, Discharge & Changed Circumstances
7.1 Expectation Damages & Their Limitations 7.2 Reliance, Restitution & Liquidated Damages 7.3 Specific Performance & Injunctive Relief 7.4 UCC Article 2 Buyer's and Seller's Remedies 7.5 Impossibility, Impracticability & Frustration of Purpose 7.6 Discharge by Agreement: Rescission, Novation & Accord and Satisfaction
8 Criminal Law: Principles of Criminal Liability & Mens Rea
8.1 Actus Reus, Voluntary Acts & Omissions 8.2 Criminal Causation & Intervening Causes 8.3 Common Law & Model Penal Code Mens Rea 8.4 Mistake of Fact, Mistake of Law & Concurrence
9 Criminal Law: Inchoate Offenses & Accomplice Liability
9.1 Criminal Attempt & Impossibility 9.2 Solicitation & the Merger Doctrine 9.3 Conspiracy & Merger Doctrine 9.4 Accomplice Liability: Actus Reus & Mens Rea 9.5 Scope of Accomplice Liability, Withdrawal & Parties to Crime
10 Criminal Law: Homicide & Crimes Against the Person
10.1 Common Law Murder & Malice Aforethought 10.2 Degrees of Murder, Premeditation & Deliberation 10.3 The Felony Murder Rule & Its Limitations 10.4 Voluntary & Involuntary Manslaughter 10.5 Non-Homicide Crimes Against the Person
11 Criminal Law: Property Crimes, Theft & Habitation
11.1 Common Law Larceny 11.2 Embezzlement & False Pretenses 11.3 Robbery & Extortion 11.4 Receiving Stolen Property 11.5 Burglary 11.6 Arson
12 Criminal Law: Defenses: Capacity, Justification & Excuse
12.1 Insanity: The Four Legal Tests 12.2 Intoxication, Diminished Capacity & Infancy 12.3 Self-Defense & Defense of Others 12.4 Defense of Property, Habitation & Law Enforcement Privileges 12.5 Duress & Necessity 12.6 Entrapment & Mistake as an Excuse
13 Torts: Intentional Torts to Persons & Property
13.1 Intent, Motive & Incapacity in Intentional Torts 13.2 Transferred Intent 13.3 Battery & Assault 13.4 False Imprisonment 13.5 Trespass to Land 13.6 Trespass to Chattels & Conversion
14 Torts: Privileges & Defenses to Intentional Torts
14.1 Consent: Express, Implied & Capacity 14.2 Exceeding & Vitiating Consent 14.3 Self-Defense & Defense of Others (Tort) 14.4 Defense of Property & Recapture of Chattels 14.5 Public & Private Necessity 14.6 The Shopkeeper's Privilege
15 Torts: Negligence — Duty of Care & Breach
15.1 Duty of Care & the Foreseeable Plaintiff 15.2 Affirmative Duties to Act & Special Relationships 15.3 Standard of Care: The Reasonable Person & Children 15.4 Professional Negligence, Informed Consent & Negligence Per Se 15.5 Land Possessor Liability & Premises Duties 15.6 Breach of Duty & Res Ipsa Loquitur
16 Torts: Causation, Defenses, Multiple Tortfeasors, Wrongful Death & Damages
16.1 Cause in Fact & Multiple Actors 16.2 Proximate Cause & Intervening Forces 16.3 Contributory, Comparative Negligence & Assumption of Risk 16.4 Joint and Several Liability, Contribution & Indemnity 16.5 Vicarious Liability & Non-Delegable Duties 16.6 Wrongful Death & Survival Actions 16.7 Statute of Limitations & Claim Accrual 16.8 Tort Damages: Compensatory, Nominal, Punitive & Mitigation
17 Torts: Strict Liability & Products Liability
17.1 Strict Liability for Animals 17.2 Abnormally Dangerous Activities & Scope of Risk 17.3 Strict Products Liability & Defect Categories 17.4 Products Liability Under Negligence, Warranty & Misrepresentation 17.5 Defenses to Products Liability
18 Torts: Emotional Distress, Defamation, Privacy & Economic Torts
18.1 Intentional Infliction of Emotional Distress 18.2 Negligent Infliction of Emotional Distress 18.3 Common Law Defamation: Elements, Libel & Slander 18.4 Constitutional Limits, Privileges & Defenses to Defamation 18.5 Invasion of Privacy 18.6 Nuisance & Economic Torts
14.5 Public & Private Necessity
Key Takeaways Explain This Topic AI
Necessity privileges an intentional interference with property to avoid a substantially greater harm, and applies only to property torts.
Public necessity, acting to protect the community from a public disaster, is a complete defense and the actor owes nothing for the damage caused.
Private necessity, acting to protect the actor's own or a few persons' interests, is an incomplete privilege: the entry is lawful but the actor must pay for actual damage done.
Because private necessity makes the entry privileged, the landowner may not lawfully expel the entrant, and doing so is itself tortious.
No compensation is owed under private necessity where no actual damage occurs, so nominal damages are unavailable.
Last updated: September 2026
Public & Private Necessity
Doctrinal Foundation: Unlike self-defense, which justifies defensive force against an unlawful human aggressor, the doctrine of necessity justifies an intentional invasion of an innocent plaintiff's real or personal property to avert a substantially greater disaster caused by natural forces or catastrophic events. It rests on the utilitarian calculation that society benefits when an actor damages or appropriates property of lesser value to preserve human life or property of substantially greater value. In retail commerce, the shopkeeper's privilege strikes a parallel balance between an individual's liberty interest against unlawful confinement and a merchant's commercial necessity to investigate suspected inventory theft without strict tort liability. On the California FYLSE, examiners relentlessly test the sharp distinction between public necessity (absolute immunity) and private necessity (liability for actual harm), the landowner's liability for ejecting a person in necessity under Ploof v. Putnam , and the strict three-prong reasonableness test governing merchant detentions.
I. The Doctrine of Necessity: Public vs. Private
Necessity operates as an affirmative defense to what would otherwise constitute an actionable trespass to land, trespass to chattels, or conversion. The common law bifurcates necessity into two distinct doctrinal categories based on whose interest is being preserved. ┌──────────────────────────────────────┐
- │ The Doctrine of Necessity │
- └──────────────────┬───────────────────┘
- │
- ┌──────────────────────────────────┴──────────────────────────────────┐
- ▼ ▼
- [PUBLIC NECESSITY] [PRIVATE NECESSITY]
- Averts imminent public catastrophe - Averts imminent private disaster
- Protects community / large population - Protects actor, third party, or goods
- COMPLETE / ABSOLUTE privilege - QUALIFIED / INCOMPLETE privilege
- IMMUNE from trespass, nominal, - IMMUNE from trespass, nominal,
- punitive, AND ACTUAL damages and punitive damages
- Surocco v. Geary (Firebreak conflagration) - MUST PAY ACTUAL COMPENSATORY DAMAGES
- Landowner CANNOT EJECT (Ploof v. Putnam)
- Vincent v. Lake Erie (Pier damage)
- 1. Public Necessity (Absolute / Complete Privilege)
- A. Rule and Elements
Public necessity arises where an actor enters private land or seizes, damages, or destroys private real or personal property under an honest, objectively reasonable belief that doing so is immediately necessary to avert an imminent public disaster affecting the community or a large number of people. Common emergencies include:
- Spreading urban conflagrations or wildland forest fires;
- Impending structural floods, dam collapses, or levee breaches;
- Outbreaks of highly contagious, lethal epidemics; or
Impending military invasion, riotous looting, or public emergencies.
B. Status of the Actor
The privilege may be exercised by public officials (such as mayors, fire chiefs, police officers, or public health authorities) or by any private citizen acting for the common defense and welfare of the community.
C. Reasonable Belief Standard
The privilege is judged by the objective facts as they reasonably appeared at the moment of the crisis. Even if post-disaster analysis reveals that the fire would have burned out naturally before reaching the plaintiff's parcel, the actor remains fully privileged if the belief was objectively reasonable when acted upon.
D. Legal Effect: Absolute Immunity
Public necessity is an absolute, complete defense . The actor is completely immune from civil liability for:
- Trespass to land;
- Trespass to chattels or conversion;
- Nominal damages;
- Punitive damages; AND
Actual compensatory damages for the destroyed or damaged property.
Important
Landmark Precedent: Surocco v. Geary (3 Cal. 69 (1853)): During a catastrophic fire sweeping through San Francisco, the Alcalde (Mayor) ordered the plaintiff's house to be blown up with gunpowder to create a firebreak and prevent the conflagration from consuming the entire city. The plaintiff sued the Mayor for the value of the house and the personal belongings destroyed inside. The Supreme Court of California held that the Mayor was completely immune from tort liability under public necessity: "A house on fire, or those in its immediate vicinity which serve to communicate the flames, is a nuisance which it is lawful of any person in authority, or even of any citizen, to abate... The individual rights of property in the conventional sense must yield to the higher consideration of public safety." The defendant is not liable for actual damages.
(Note on Constitutional Takings: While a property owner may sometimes assert an inverse condemnation claim against a governmental entity under state or federal constitutional takings clauses, the common law tort privilege of public necessity completely shields the individual tortfeasor from common law tort liability).
- 2. Private Necessity (Qualified / Incomplete Privilege)
- A. Rule and Elements
Private necessity arises where an actor enters the land of another, moors a vessel to a private dock, or interferes with another's personal property to prevent serious, imminent harm to the actor's own person, a third person, or the actor's own property/goods .
B. The Incomplete Nature of the Privilege: The Dual Holding
Private necessity is described as a qualified or incomplete privilege because it produces two distinct, interrelated legal consequences:
Privilege Against Trespass & Right of Sanctuary (No Ejection):
The actor's entry or presence is lawful. The actor commits no tortious trespass and cannot be subjected to nominal or punitive damages.
Landowner's Loss of Defensive Privilege: Because the intruder is legally privileged, the landowner has no legal right to use force to repel, resist, or eject the intruder.
Landowner Liability for Ejection ( Ploof v. Putnam , 81 Vt. 471 (1908)): During a sudden, violent storm on Lake Champlain, Ploof moored his sloop, carrying his wife and children, to Putnam's private dock to avoid sinking. Putnam's dock caretaker unmoored the sloop and cast it adrift. The sloop was driven ashore by the tempest and smashed against rocks, destroying the boat and severely injuring Ploof's family. The Supreme Court of Vermont held the landowner liable for trespass and battery: An entry upon land or mooring to a dock under the stress of private necessity is lawful. The landowner has no right to unmoor the vessel or eject the occupants, and doing so renders the landowner strictly liable for all resulting personal injuries and property loss.
The Mandatory Obligation to Pay for Actual Harm ( Vincent v. Lake Erie Transportation Co. ):
While the actor is privileged to remain on the property to save life and chattel, the actor must pay for all actual physical damage inflicted upon the plaintiff's real or personal property.
Landmark Precedent: Vincent v. Lake Erie Transportation Co. (109 Minn. 456 (1910)): A cargo steamship was moored to a commercial pier discharging iron ore when an unusually severe November storm arose on Lake Superior. As the gale intensified, navigation was impossible. The steamship's crew repeatedly replaced frayed mooring lines with heavier cables to hold the vessel tight against the pier. The fierce wind and waves battered the ship against the dock, inflicting $1,200 in structural damage to the pier. The Minnesota Supreme Court held that the steamship owner was privileged to preserve its multi-thousand dollar vessel by keeping it tied to the dock, but was legally obligated to compensate the dock owner for the actual physical damage caused: The defendant deliberately availed itself of the plaintiff's property to preserve its own valuable ship. While there was no tortious trespass, justice and equity demand that the party who reaped the benefit of saving its property at the expense of another's estate must repair the actual damage inflicted.
Comprehensive Comparison: Public vs. Private Necessity
Dimension Public Necessity Private Necessity
Interest Protected Public at large / community / substantial population Actor's own person, family, or private property
- Nature of Privilege Absolute / Complete Qualified / Incomplete
- Trespass Liability Immune (No trespass committed) Immune (No trespass committed)
- Nominal & Punitive Damages Immune (None awarded) Immune (None awarded)
Actual Property Damages IMMUNE (Defendant owes $0 in tort damages) STRICTLY LIABLE (Defendant must pay for actual damage)
- Landowner Right to Eject None (Unlawful interference) None (Landowner strictly liable if ejects)
- Seminal Precedent Surocco v. Geary (1853) Vincent v. Lake Erie (1910); Ploof v. Putnam (1908)